Method of truing up the drawing-rolls of spinning or twisting machines.



No. 697,262. Patented Apr. 8, |902. F. M. MARCY.

METHOD 0F TRUING UP THE DRAWING ROLLS 0F SPINNING 0R TWISTING MACHINES.

' (Application le (Nn Model.)

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j? Eli #ovv-legs UNTTED STATES PATENT OFFICE.

FRANK M. MAROY, OF lVORCESTER, MASSACHUS'ETTS.l

METHOD OF TRUING UP THE DRAWING-ROLLS OF SPINNING OR IWISTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 697,262, dated April .8, 1902. A

Application filed August 21,1901. Serial No. 72,764- (No model.)

To all whom, it inn/,y concern:

Be it known that l, FRANK M. MARCY, a citizen of the United States, residing at Vorcester, in the county-of Worcester and State of Massachusetts, have invented a new and useful Method of Truing Up the Drawing-Rolls of Spinning or Twisting Machines, of which the following is a specification.

-This invention relates to a method of truing up or equalizing the diameters of the drawingrolls of spinning or twisting machines, which has been especially devised with a view of providing a simple and efficient method of truing up the drawing-rolls of spinning and twisting machines which have been more or less worn out or rendered out of true.

In the accompanying drawings, Figure l is a perspective view ofthe apparatus employed for practicing this method with clamp opened. Fig. 2 is a perspective view showing the clamp closed onto a drawing-roll. Fig. 3 is a similar view showing the parts in a different relative position. Fig. 4 is a sectional view of a partially worn-out or grooved drawing-roll, and Fig. 5 is a similar view of the roll after the same has been trued up or resurfaced according to this invention.

One difficulty arising in the use of spinning and twisting machines is due to the grooving or wearing out of the central parts of the drawing-rolls. In ordinary spinning or twisting machines the drawing-rolls are covered with leather or similar material, and when the same have been run even for comparatively short periods the constant passage of thread between the rolls will wearout or compress the central part of the drawing-roll coverings, while the rolls will loe comparatively slightly worn at their ends. This will render the drawing-rolls of less diameter near their centers than at their ends, and when the rolls have worn to a considerable extent along their centers in this manner they will fail to feed the thread forward with the desired reliability. On this account the drawing-rolls of spinning or twisting machines frequently have to be renewed.

The especial object of my present invention is, therefore, to provide a method of truing up the partially-worn rolls of spinning or twisting machines, so as to render them of uniform diameter throughout their lengths.

ln one form of drawing-roll which is quite extensively employed the covering comprises two layers, consisting of an inner layer of felt or other fibrous material and an outer layer of leather. When a drawing-roll of this construction has been run for any length of time, the central part of its leather covering will become worn or compressed, as illustrated in Fig. 4.

To true up a drawing-roll according to this invention, the roll is first mounted on a rotating arbor, and pressure is then applied to the surface of the same while it is turning or rotating.

In practice in order to secure uniformity in the diameters of renished drawing-rolls I preferably employ a clamp for squeezing or applying pressure to the rotating rolls, and in order to secure the best results I have found in practice that it is desirable to move the clamp back and forth during the'operation in order to apply pressure at different points along the length of roll being operated upon. By means of this method I have found in practice that I am enabled to refinish worn or partially-worn-out drawing-rolls, so that the same may be used with equal efficiency with new rolls.

The application of pressure to a drawingroll while the same is being rotated or turned I have found in practice will not simply compress the felt and leather, but will also cause shifting or a longitudinal movement of the iibers of the inner layer of felt, this action being assisted by the back-and-forth movement of the clamp above referred to.

Referring to the accompanying drawings and in detail, a drawing-roll for a spinning or twisting machine as herein illustrated comprises a metallic tube or bushing 10, having an exterior covering comprising a layer of feltllandanouterlayerofleather12. When a drawing-roll of this construction has been run for any considerable length of time, the central part thereof will be worn down or rendered of smaller diameter than the end sections of the roll, as illustrated in Fig. 4. To true up or resurface a worn-down roll of this character, the roll is mounted on a rotating arbor 13, as illustrated in Fig. l, and pressure is then applied to the rotating roll by means of a clamp. The clamp herein illustrated YCO comprises grooved metallic pieces 14, which are connected together' by straps 15 and are provided With handles 16. The clamp-pieces 14 are provided at their inner ends With pivotgrooves 17, which are adapted to receive a pivot-rod 18 to form a pivot about Which the clam p-sections 14 turn when they are clamped onto the roll by their handles 16.

To regulate the diameters of the refinished rolls and the pressure which can be applied by the clamp, one of the clamp-sections 14 may be provided With a set-screw 19, Which may be adjusted as desired. By means of this construction When the clamp-sections are closed onto the roll, as illustrated in Fig. 2, the clamp is preferably shifted back and forth longitudinally, as indicated in Figs. 2 and 3.

' By means of this operation a partially-Wornoutdrawing-roll may be rendered of uniform diameter throughout its length, as indicated in Fig. 5, and this action I have found not to be due simply to a compression of the coverings of the drawing-roll, but is also due to a considerable extent to the longitudinal shifting and repositioning of the fibers of the inner felt layer-that is to say, the refinishing or truing up of drawing-rolls according to my invention diifers essentially from the ordinary polishing or abrading processes practiced in finishing shafting or similar cylindrical bodies in the ordinary turning-lathe, because the ordinary polishing or shaping processes practiced in lathes are abrading processes, Which depend on cutting off and removing the material which is being operated upon, Whereas in practicing my method of truing up drawing-rolls the roll-coverings are not finished or trued up bya cutting or abrading process, but, on the contrary, they are brought to uniform diameters by a compression of the materials, and I regard this as the essential feature of my invention, as I have found it undesirable to employ abrading or cutting processes for truing up drawing-rolls, as such processes necessarily remove and sandpaper off the polished or finished surface of the leather coverings, Which surface is not removed or injured b'y truing up rolls according to my invention. Furthermore, my invention so far as the same is applied to that form of drawing rolls in which the leather coverings are mounted on layers of felt is based in a large measure upon the discovery that the progressive ironing or pressing operation performed according to my invention produces a complete redistribution of the bers in the felt backing of the rolls, so that when the rolls are finished the materials constituting the roll-coverings will not be simply compressed down at the high points thereof, so as to be liable to again swell out when exposed to moist atmosphere or when relieved from pressure, but, on the contrary, such coverings Will be permanently set by the redistribution of the felt fibers to the uniform diameter required, so that a roll refinished according to my invention is capable of wearing even longer than the ordinary new rolls noW employed.

My invention is also to be distinguished from methods of forming seamless tubing from metallic ingots in which rolls are employed for rolling heated metal tubes, as in practicing my invention the roll coverings or cushions are simply reshaped or lironed down instead of involving a tube-drawing operation.

I am aware that many different forms of apparatus may be devised by those who are skilled in the art for practicing my invention without departing from the scope of my invention as expressed in the claims. I do not wish, therefore, to be limited to the details of operations herein described; but

What I do claim, and desire to secure by Letters Patent of the United States, is-

1. The method of truing up an old and Worn drawing-roll, said roll consisting of a core having coverings of soft material, Which consists in rotating the roll and applying pressure thereto, to render said roll uniform in diameter by a compression of the materials with which said roll is covered.

2. The method of truing up an old and Worn drawing-roll, said roll consisting of a core having coverings of soft material, Which consists in rotating the roll and progressively applying pressure at different longitudinal points on said roll, so as to render the roll uniform in diameter by a compression of the materials with Which the roll is covered.

3. The method of truing up an old and Worn drawing-roll, said roll consisting of a tube having coverings of soft material, Which consists in mounting the roll upon a rotating arbor and rendering the same uniform in diameter by a compression of the materials with which the roll is covered, applied by squeezing the roll in a clamp While the roll is being rotated.

4. The method of truing up an old and Worn drawing-roll of a spinning or twisting machine, said roll consisting of a shell covered with a layer of felt and a facing of leather, Which consists in mounting the same upon a rotating arbor, and then rendering the same uniform in diameter by a compression of the materials With which the roll is covered, so as to secure the shifting and repositioning of the fibers of the inner felt layer of the roll, said compression being applied by squeezing 'the roll in a clamp While the same is being rotated, and shifting the clamp to different longitudinal points along the roll.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses.

FRANK M. MARC Y.

Witnesses:

PHILIP W. SOUTHGATE, HENRY E. HILL.

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